Metal deforming – With cutting – By composite tool
Patent
1975-09-30
1978-03-07
Larson, Lowell A.
Metal deforming
With cutting
By composite tool
72379, 72385, 291635R, B21D 2826
Patent
active
040772470
ABSTRACT:
A method of improving the formability of sheet metal wherein the sheet metal is formed by die pins contacting spaced parts of the sheet with the properties of the sheet material itself determining the actual condition of curvature between the spaced parts contacted by the die pins. The sheet metal is perforated at the spaced part of the sheet contacting each die pin so that as each die pin is pressed into the sheet, each perforation expands and additional sheet material is supplied to the shoulder of the pin. Tops of the die pins can be modified with a boss to locate the perforations in the sheet metal and position it in respect to the die pins. Modified die pin tops can be formed with pointed inserts so that solid sheet metal can be used with the inserts piercing the sheet and the die pins then forming it. The sheet metal can also be partially formed and then perforated before the final forming.
REFERENCES:
patent: 1481000 (1924-01-01), Erickson
patent: 2157354 (1939-05-01), Sherman
patent: 2859510 (1958-11-01), Baxa
patent: 3083662 (1963-04-01), Zeidler
patent: 3525663 (1970-08-01), Hale
patent: 3902348 (1975-09-01), Hale
patent: 3938963 (1976-02-01), Hale
Larson Lowell A.
McCarthy Jack N.
United Technologies Corporation
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